Micrometer-calipers



(No Model.)

A. B. BROWN. MICRME'IBRCALIPERS.

' 155552559. Patented Jan. '7, 1895- `Ql|- I. mi 5 z a Enum.. mijn fT a W M MH 6 mi um w Hl AXEL B. BROIVN, OF CHICAGO, ILLINOIS.

IVIICROIVIETERCALIPERS.

SPECIFICATION forming part of Letters Patent No. 552,659, dated January 7, 1896.

Application filed October 14, 189,5;

To @ZZ whom t may concern:

Be it known that I, AXEL B. BROWN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Micrometer-Calipers, of which the following is a specication.

This invention relates to improvements in micrometer-calipers; and it consists in certain peculiarities of the construction, novel arrangement', and operation of the various parts thereof, as will be hereinafter more fully set forth and specifically claimed.

The objects of my invention are, first, to provide an instrument for obtaining` accurate, precise, and minute measurements g second, such an instrument which shall be simple and inexpensive in construction, strong and durable, yet effective in operation; and, third, a micrometer-calipers in which the parts are so constructed and operate as to prevent any incorrect measurement by reason of the wear-` ing of the parts. In other words the parts are so constructed that they may be readily adjusted to prevent any false movements of the measuring mechanism when said parts become worn by usage.

In order to enable others skilled in the art to which my invention pertains tomake and use the same, I will now proceed to describe it, referring1 to the accompanying drawings, in which- Figure l is a view in side elevation of my micrometer-calipers, showing it foreshortened, with the parts in position for use. Fig. 2 is a view in elevation of the movable jaw and its graduated slide. Fig. 3 is a longitudinal sectional view taken on line 3 3 of Fig. l. Fig. 4 is a perspective view of a portion of the cylindrical handle of the instrument. Fig. 5 is a similar view of a split washer or disk used to prevent the longitudinal movement of the micrometer-screw. Fig. 6 is a perspective view of a screw-threaded washer detached from the cylindrical handpiece.- Fig. 7 is a cross-sectional view taken on line 7 7 of Fig. 3, and Fig. S is a diagrammatic view of the indicating-scale on the handpiece and regulating knob or collar.

Similar letters refer to like parts throughout the different views of the drawings.

A represents a hollowT handpiece, which is.

Serial No. 565,599. (No model.)

made of any suitable size and form, but preferably cylindrical, as shown in the drawings. The upper portion of the handpiece A is formed with an opening o, for the reception and operation of the graduated slide-piece B, which is formed at its upper end with a jaw or projection B', extending at a right angle therefrom. This slide-piece is usually made rectangular in cross-section, and when so made the opening o. in the piece A is made of a corresponding form; but, if desired, I may sometimes make the slide-piece B of other shape in cross-section, when the opening d will be correspondingly formed.

The face and back surfaces of the slide- `piece B are provided with scales or marks of any suitable graduations to indicate the 1n easurements between the jaws of the instrument. At its upper end and on its outer surface the handpiece is formed or provided with a stationary jaw B2, and diametrically opposite the same is fixed an arm B3, which is approximately semicircular in form, so that its. eX- tended portion or jaw BL1 will occupya position parallel with the jaw or projection B2, and also with the jaw B on the slide-piece.

The lower portion of the handle A is formed with an internal iiange or rim a', through which is passed the screw C, upon which are formed very fine screw-threads, and usually about forty thereof to the inch. This screw is provided on its lower portion with an annular groove c, in which the beveled portions cl of the pieces of the split washer D lit, as is shown in Fig. 3 of the drawings. The pieces D are adjustably held in position by means of set-screws CZ', located in the lower portion of the handpiece. Outwardly from the split washer, and in the end of the handpiece, which is screw-threaded, as seen in Fig. 4, is secured a screw-threaded washer D', through which the lower end of the screw Cpasses and forms a bearing therefor, as well as a protection for the interior of the handpiece. y On the outer end of the screw-rod C is secured a regulating collar or knob E, which is milled, as at c, for convenience in turning, and is provided on its upper part with a graduated scale c' to indicate the desired measure or movement of the slide-piece, which slide-piece is formed hollow and internally screw-threaded, as shown in Fig. 3, and engages the screw ICO C, by which it is operated. rlhe lower portion of the slide-piece B is split and reduced and formed with external screw-threads l) to engage the screw-threaded collar 1)' to be used Yfor tightening said split portion on the screw Whenthe threads thereof shall have become worn from much use.

In one side of the opening a in the handlepiece is located a plate a2, which contacts with one side of the slide-piece and is caused to impinge therewith, when desired, by means of the thumb-screw as, located in the handpiece. The plate CL2 is prevented from moving longitudinally by means of the securing-pins a4, which also pass through the handpiece.

From the foregoing, and by reference to the drawings, it will be seen and readily understood that by turning the regulating collar or knob E the screw will be revolved thereby, which action will extend or retract the slidepiece B, carrying the jaw B', and will increase or diminish the distance between said jaw and the jaws B2 and B4.

By reference to Fig. 8 of the drawings it will be seen that the knob or collar E is provided with a scale divided into twenty-five parts, and that on the handpiece A is also a scale divided into eight parts and indicated by O, Gif, 32, and 16. lf it is desired to extend or retract the jaw B one-fortieth or .O25 of an inch, the knob E must be turned once around on the handpiece. To move the jaw 3 .O01 of an inch it is only necessaryto turn the knob E the distance of one of the spaces thereon, and if it is required to move the jaw B one sixty-fourth of an inch or 15.625 the knob must be turned a fraction over the distance of three spaces, or about onequarter around, and twice said distance to obtain one thirty-second of an inch movement, and one-half around to cause the jaw to move one-sixteenth of an inch. To obtain the outside measurements of the jaws B, B2, and Bl the instrument is held in the position shown lin Fig. l of the drawings, when the scale on the slide-piece B will indicate the exact distances, and to obtain the inside measurement between said jaws the instrument is turned so as to present the scale on the sliding piece B, as shown in Fig. 2 of the drawings.

Having thus fully described my invention, what l claim as new, and desire to secure by Letters Patent, is-

1. The combination of a hollow hand-piece provided on one of its ends with a fixed jaw and a bent arm opposite said jaw, with a graduated slide piece, having on its free end a jaw, parallel and in alignment with the end of the bent arm and the jaw on the handpiece, a screw within the hand-piece and engaging the slide to extend and retract the saine, and a knob ixed on the outer end of the screw-rod and provided with a graduated scale, substantially as described.

2. The combination with the hollow handpiece A, having near one of its ends the scale c', and the flange or rim a', and provided at its other end with the lixed jaw B2, and bent arm B3, provided with the jaw B4, of the hollow screw-threaded slide-piece B, provided with the jaw BQ and graduated scales, and adapted to operate in the hand-piece, the screw C, having the annular groove c, and engaging the 'slide"piece, the adjustable washer D, located in said groove, the graduated knob E, fixed on the end of the screw-bolt, and the set plate a2, and thumbscrew a3, all constructed, arranged and operating, substantially as described.

AXEL B. BROVN.

Vitnesses:

GHAs. C. TILLMAN, E. A. DUGGAN. 

